1, that recipe already has couscous in it.
2, What is it you are worried about wrt freezing it or defrosting it? If I gave you a bowl of pasta, how would you reheat that? Couscous is after all just another type pasta. It is simply steamed small grains of durum wheat. Nothing 'special'.
As with all freezing of anything, you freeze it as soon as possible after it has reached room temperature.
Reheating couscous needs a few extra tablespoons of water adding and the zapping in the microwave until streaming hot. However it would be in your curry sauce already so just add a touch more liquid before freezing and reheat from frozen.
As with rice and other grains if left out on the worktop bacteria and other "bugs" will start to grow, so freeze as soon as possible and ensure it is piping hot when reheated.
But looking at that recipe, several things strike me immediately. I'm really hoping you're not thinking that this is a healthy recipe because it's vegan? It isn't healthy. The first thing that strikes meis 3tbsp of coconut sugar, I don't really understand why it has sugar in it in any form at all, and then there's a lot of coconut milk. The recipe has a huge amount of calories per portion for very little protein (13g), and a considerable amount of fat (37g), and worse still, saturated fat (27g) (from the coconut milk). It might taste good but I wouldn't be considering that a healthy meal in this household. For one, where is the veg? All you have in there are 1 can of chickpeas and that's 1 can between 4 servings, that's not even a full portion in your 5 a day. It's only just at 50-55g of 80g of 1 of your 5 a day and you've wasted 580kcal and acquired a lot of saturated fat in the process. Half a cup of carrots is around 85g, so 1 medium sized carrot between 4 portions isn't going to go a long way to helping with healthy eating. Similarly with the onion. That might be ½ an onion between 4 portions. A single serving of any veg including onions and carrots on the NHS 5 a day is 80g which is roughly half a medium onion or an entire medium sized carrot.
Sorry. I'd be looking at cutting the coconut milk a long way back (½ to 1 cup at the most) and using a non-dairy milk such as almond milk to increase the fluid to original volumes. I'd also be looking at increasing the chickpeas, probably by doubling the content or adding in something like yellow split peas to increase the overall bean/pea content to a full 80g portion each serving. I'd use an entire onion minimum and probably 4 medium carrots as well.. that way you'd have a healthier meal with more veg servings, more protein, less fat/saturated fat and fewer calories, so you can serve it with something else.
